Here's some shots of my Antec300. I did some pretty basic mods including cutting out the side window ( I decided to leave the side fan so I cut around it) and adding access holes for routing the psu cables behind the motherboard. Also, I reversed the HDD's which is real easy in this case. My next mod will probably be to replace the antec tri-cool fans with coolermaster led fans. They're much quieter than the tri-cools and flow just as much air. I included some before and after pictures. Hope this helps you decide.
One more thing, when I cut out the side panel, I used a nibbler tool. Best $7 that I invested. TONS cleaner than a jigsaw or sabre saw and a lot less dangerous!
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